'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

/**
 * @desc 解决浮动运算问题，避免小数点后产生多位数和计算精度损失。
 * 问题示例：2.3 + 2.4 = 4.699999999999999，1.0 - 0.9 = 0.09999999999999998
 */
/**
 * 把错误的数据转正
 * strip(0.09999999999999998)=0.1
 */
function strip(num, precision) {
  if (precision === void 0) { precision = 12; }
  return +parseFloat(num.toPrecision(precision));
}
/**round
 * Return digits length of a number
 * @param {*number} num Input number
 */
function digitLength(num) {
  // Get digit length of e
  var eSplit = num.toString().split(/[eE]/);
  var len = (eSplit[0].split('.')[1] || '').length - (+(eSplit[1] || 0));
  return len > 0 ? len : 0;
}
/**
 * 把小数转成整数，支持科学计数法。如果是小数则放大成整数
 * @param {*number} num 输入数
 */
function float2Fixed(num) {
  if (num.toString().indexOf('e') === -1) {
    return Number(num.toString().replace('.', ''));
  }
  var dLen = digitLength(num);
  return dLen > 0 ? strip(num * Math.pow(10, dLen)) : num;
}
/**
 * 检测数字是否越界，如果越界给出提示
 * @param {*number} num 输入数
 */
function checkBoundary(num) {
  if (_boundaryCheckingState) {
    if (num > Number.MAX_SAFE_INTEGER || num < Number.MIN_SAFE_INTEGER) {
      console.warn(num + " is beyond boundary when transfer to integer, the results may not be accurate");
    }
  }
}
/**
 * 精确乘法
 */
function times(num1, num2) {
  var others = [];
  for (var _i = 2; _i < arguments.length; _i++) {
    others[_i - 2] = arguments[_i];
  }
  if (others.length > 0) {
    return times.apply(void 0, [times(num1, num2), others[0]].concat(others.slice(1)));
  }
  var num1Changed = float2Fixed(num1);
  var num2Changed = float2Fixed(num2);
  var baseNum = digitLength(num1) + digitLength(num2);
  var leftValue = num1Changed * num2Changed;
  checkBoundary(leftValue);
  return leftValue / Math.pow(10, baseNum);
}
/**
 * 精确加法
 */
function plus(num1, num2) {
  var others = [];
  for (var _i = 2; _i < arguments.length; _i++) {
    others[_i - 2] = arguments[_i];
  }
  if (others.length > 0) {
    return plus.apply(void 0, [plus(num1, num2), others[0]].concat(others.slice(1)));
  }
  var baseNum = Math.pow(10, Math.max(digitLength(num1), digitLength(num2)));
  return (times(num1, baseNum) + times(num2, baseNum)) / baseNum;
}
/**
 * 精确减法
 */
function minus(num1, num2) {
  var others = [];
  for (var _i = 2; _i < arguments.length; _i++) {
    others[_i - 2] = arguments[_i];
  }
  if (others.length > 0) {
    return minus.apply(void 0, [minus(num1, num2), others[0]].concat(others.slice(1)));
  }
  var baseNum = Math.pow(10, Math.max(digitLength(num1), digitLength(num2)));
  return (times(num1, baseNum) - times(num2, baseNum)) / baseNum;
}
/**
 * 精确除法
 */
function divide(num1, num2) {
  var others = [];
  for (var _i = 2; _i < arguments.length; _i++) {
    others[_i - 2] = arguments[_i];
  }
  if (others.length > 0) {
    return divide.apply(void 0, [divide(num1, num2), others[0]].concat(others.slice(1)));
  }
  var num1Changed = float2Fixed(num1);
  var num2Changed = float2Fixed(num2);
  checkBoundary(num1Changed);
  checkBoundary(num2Changed);
  return times((num1Changed / num2Changed), Math.pow(10, digitLength(num2) - digitLength(num1)));
}
/**
 * 四舍五入
 */
function round(num, ratio) {
  var base = Math.pow(10, ratio);
  return divide(Math.round(times(num, base)), base);
}
function fixed2(num){
  return (Math.round(times(num, 100)) / 100).toFixed(2)
}
function fixed3(num) {


  return (Math.round(times(num, 100)) / 100).toFixed(3)
}
var _boundaryCheckingState = true;
/**
 * 是否进行边界检查，默认开启
 * @param flag 标记开关，true 为开启，false 为关闭，默认为 true
 */
function enableBoundaryChecking(flag) {
  if (flag === void 0) { flag = true; }
  _boundaryCheckingState = flag;
}
var index = { strip: strip, plus: plus, minus: minus, times: times, divide: divide, round: round, digitLength: digitLength, float2Fixed: float2Fixed, enableBoundaryChecking: enableBoundaryChecking, fixed2: fixed2, fixed3: fixed3 };
module.exports = index

